Furnace construction



April 4, 1944. M. RosEN FURNACE CONSTRUCTION Filed Jari. 27. 1941 I ntl' I Flaw (all |NVENTOR BV-yef' 576.5627. l l y we.

ATTOR V5.

Patented Apr. 4, 1944 UNITED'STATES PATENT OFFICE 2,346,050 FURNACE CONSTRUCTION Meyer Rosen, Monroe, Mich.

Application January 27, 1941, Serial No. 376,037

1 Claim.

My invention relates to furnace constructions, and particularly to a heat resisting ring disposed in the throat of the combustion chamber of va furnace.

The furnace embodying my present invention includes a cylindrical combustion chamber formed from a sheet of metal which is drawn in at the top to form a throat of reduced diameter. An angular shaped ring is welded about the throat of the combustion chamber for the purpose of receiving the ange of a heat interchanger which is sealed Within the ring. Vanes are provided on the sloping surface, welded thereto and to the angular shaped ring to increase the heat interchanging capacity of the combustion chamber.

` Strength is also provided for the ring and the sloping portion which supports the heat interchanger. In View of the restricted area at the throat of the combustion chamber and the presence of the angular ring and the sealing material. a concentration of'heat occurs at this point which deteriorates the metal and causes material erosion. To protect the throat from the fires of combustion concentrated at this pointY a ring of cast material is disposed over the inner surface of the lmetal and the burning is resisted by the ring which withstands the heat more readily than the sheet steel from which the combustion chamber is constructed.

Accordingly, thevmain objects of my Vinvention are; to form a combustion chamber for a furnace from sheet metal which slopes inwardly at the top to form a throat which is protected from the flames of combustion by an element which is fire resisting; to cast a ring in three sections from iron having a anfge by which the` ring may be assembled upon the throat of a combustion cham ber; to form a combustion chamber with a reduced throat portion having a trough formed thereabout in which an end of an interchanger is sealed, and protecting the surface of the throat portion from the fire of combustion by a heat resisting ring; and in general, to provide a furnace with a fire chamber having a throat portion which is protected by a heat resisting ring.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure 1 is a view in perspective of a furnace, embodying features of my invention;

Fig. 2 is an enlarged sectional view of structure illustrated in Fig. 1, taken on the line 2 2 thereof; and

Fig. 3 is a plan view of the protecting ring, in section, employed on the threat of the combustion chamber of the furnace as illustrated in Fig. 2

'I'he furnace embodies a combustion chamber 3 having its upper end of frusto conical shape as indicated at 4 by drawing the Imetal inwardly at this point. The upper edge of the frusto conical portion i is further extended upwardly into a cylindrical collar 5 forming a throat through which the heat and flames of combustion pass out of the chamber 3. An angular shaped ring 6 extends over the outer surface of the collar 5 and is welded thereto forming an upwardly presented channel l. Radially disposed vertical fins -8 are welded to the outer surface of the frusto conical portion 4 and to the angular ring 6 to provide strength to the portion and ring and an increase in area for a transfer of heat to the air encompassing the combustion chamber.

A heat interchanger 9 is provided with a central cylindricalelement I I the extending portion I2 of which is sealed within the channel l formed by the angular ring 6. A re resisting ring I3 made of cast iron, or ceramic materials which resist burning, is suspended over the inner surface of l the collar or throat 5 of the combustion chamber.

Due to the sloping portion fi of the combustion chamber the heat and ame is concentrated within the area defined by the collar 5 and any burning which might occur from the heat causes erosion of the surface of the collar.

The application of the fire resisting ring I3 over the surface of the collar protects the collar and any burning which might occur Will aiect the ring which is removable. The ring is made of a plurality of sections I 4, herein being illustrated as three in number, the arc of each section being 12.0 degrees. The ring is provided with a ange I5 at the top edge which engages the top edge of the collar 5 to form the support. By making the ring in a plurality of sections the ring is readily removed for repair or replacement from within the furnace.

While I have illustrated and described but a single embodiment of my invention, it will be apparent to those skilled in the art that various changes, omissions, additions and substitutions may be made therein without departing from the spirit and scope of my invention, as set forth in the accompanying claim.

What I claim is:

In a furnace, a chamber having a portion tapering toward an outlet opening defined by a collar in which the products of combustion are concentrated when passing from the chamber causing over heating of the collar material, and an element of heat resisting material divided into a plurality of sections having a ange extending from the outer surface thereof for positioning the sections over the inner surface of the collar when in engagement therewith to prevent the direct heating of the collar material at the point of heat concentration.

MEYER ROSEN. 

